bf.n:10:5:10:12: error: parse error near keyword `mutable': expected `{' at the beginning of function body
bf.n:10:13:10:17: error: parse error near identifier `exps': unexpected token after type declaration (you forget a closing bracket?).
bf.n:16:17:16:18: error: expecting '{' after 'match (e)'
bf.n:16:19:16:22: error: expected `;'
bf.n:16:19:16:22: error: parse error near character literal: unexpected token after expression in sequence (you forget a closing bracket?).
bf.n:35:17:35:18: error: parse error near operator `|': expecting expression
bf.n:35:19:35:20: error: expected `;'
bf.n:35:19:35:20: error: parse error near keyword `_': unexpected token after expression in sequence (you forget a closing bracket?).
bf.n:37:5:37:9: error: expected `;'
bf.n:37:5:37:9: error: parse error near identifier `exps': unexpected token after expression in sequence (you forget a closing bracket?).